In SkyDrive, you can see version history by selecting a file from the Web interface and then going to File, Previous Versions. This action will bring up a sidebar with all of your latest document changes.

SugarSync also offers a version-control feature, but it is less robust since it keeps only your last five file saves.

Cloud storage helps you access your files anywhere you can get an Internet connection--except when it comes to video. Since streaming video takes up more bandwidth than downloading a document or streaming music, how much you can stream depends on your cloud provider. During my testing with a 315MB, 77-minute M4V file, Dropbox streamed the entire content when I used the service's mobile apps. But I could not watch the video in a mobile browser, and on my PC I was able to stream only a 15-minute preview.

Google Drive let me view the entire video content on the Web, but streaming didn't work on any of the mobile devices I tried. In addition, Google Drive makes you wait while it processes the video file for streaming.